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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8ca0f67ed519e3d57c919eb362e8ff9b1b67c63bd04d2eba5f1a65ae5c976dd2' 
  AND token = '8VWztldvL4sKdRvsFN6vSUr8Y1/Q12ER6L6PZzx0l2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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