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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a5162b37ed695da6dc5ec961b64929db2c9afb3995e8b63445ee2c6be44bd77' 
  AND token = 'nywJZ4eh8r/R0Kjt98H62N4vIWFc2Juza1FyPpEOg40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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