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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '233a14ae749137b310d31bdb2e0277be3bbf3fe6012791bc4beaff40a9e7efb0' 
  AND token = 'M7kh6kx2XVFp6zeiCU9QeWMKy3OzFurjPyzYbuEHDi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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