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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c7b3a33d07739d31f91e3bcf96afd40515b52bf9f3b0b1fdcb78dba08b24b86b' 
  AND token = 'V0CdZB4bd6ov2eCJfbTCpXNmvM7jkdhUhM6lQLAQktU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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