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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42ce5f03549011b7a9f59064d603cacd6733f17c73f69434a1ec21765cfc690e' 
  AND token = 'OV7/gZj7BsWzOpnXEXgm0tzuba83wu703bhMEDm5Hdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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