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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ab5159b87c2853b7bf619488f27d1e41c05b9ce328e1ffcda579d1ad661c512' 
  AND token = '3YkR00dLCEORa+pcifkFyqrI/yCY3EckBbY8O5LXTLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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