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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '51d1c09ba94f098944d4f3a887baa6a950edd94c9b1e5c9b9d541f3c13e92db5' 
  AND token = 'yZS6O9jY4p+UTxGWHRP36NnIeDi5DDSxSu+ujOVmWnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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