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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e0de55d1a961540e59d88ada3e348c2e3c459997f8c9dc633c7b8bce87a471a' 
  AND token = '3K1Z0xKwL5AxnW91P8h9AmKxXqkDH0nXk6+b64J7Wpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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