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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5ca1639c2ab37ba4418faac9c967cd63d0081b37153eabb0fdd350141f257a4e' 
  AND token = 'cWSPrsndUfFgVOl+l/nj0WDwRdHvNNi8N6XHQU9akiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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