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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '452adc4f1c24ada373badf81f46cb5e4a3f3b024c57cde54377bebce4212b6fe' 
  AND token = 'FKiXVnC+6N3I+Nhm/n3Qfvij6E0xoLrIA6WITeltNag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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