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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e412617fb21ed8d4a058ef0a9281d6166306527d47c1951ac08dda38714fcbd' 
  AND token = '8U3CgsjWEVsAypx6Igpl/L4mdKMFZcsw9TUrvVkyIdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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