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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7f078c3a902d71f93346048bb21042b7f37eab17ec6aac1431c9bd8271df1ba1' 
  AND token = 'P2Z7dzBT2Z0JShPKrbkGv79sSBex1zpqwO3A8xN4LLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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