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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48366ad59b77b18af8937d7ea0758b69d820cdd81b085703d19daeb08560ec1b' 
  AND token = '7Hx+RarM3jTsW0GZ9Xo8F/ktfA7suCmcr3SqukFHq54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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