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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd814521c4853d901edd7f87a7e89cfd0518496d5cc4fbf0144553758745cedbf' 
  AND token = 'LPhkr7M8oVWWashGbdAihnO5eSZYx75KNcFFflYf8gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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