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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aaea02c833270d1d3db98023741f37e7b9dfc987878a4f13c1f14dc68d06f257' 
  AND token = 'oOru1MZhMiI0BFBvU/9Omn+AL04pwl1Fe43wbZBAM94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}