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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af6301d43ef0d49e01cc8fda9e8b30d258c865156c310e673d80a05e9ab28f92' 
  AND token = 'nd2ra7tRskq665xjNYrsFEzSnKQSXU6updWLK6yaUNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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