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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '031d9713a5e91e1ca554f5974cdc75693036a8400368472cf8b29758fd633170' 
  AND token = '4U4fkwRj7UP9W71aBqyprQkBipyPNw7Mt9ffgq2L0io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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