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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e9874fc085dcbcc05c100fa7332cc1d81944a64b92cb0c01b34a6781c812be2' 
  AND token = '+FWu/enh3cSHDuwYcQIFimdYyiUif9TrIZQ9hAfX4Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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