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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1a18b6437dfb83ed2b0b4d6c6c402f6ad6f68a66ad701d2b4a217a5c3a68128d' 
  AND token = 'GzMR7UIj/MwctHORYNbEFAKk49c5D0fgDNItWQe5Srk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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