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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2df502aa7a196a30b7ff295d3810976202c58a81de1bb03e8a07b8d661464efa' 
  AND token = 'dREnOIw0WA18UofunhIkKMIPP2Z6HFfFAHR42Bn6S9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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