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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e90ec5c75afb7eaf722c1a81d19d5a73f8a554e760280f68a5107689bf1d88d0' 
  AND token = 'OgePe2u2UueOTnEJPFfzirxTmx8fFwDSE1xXfhBcFWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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