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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b751277b35f451af8b07cc7b2e9bca58af455bfefa3cc224f528357cc8c09b25' 
  AND token = '5rxhBo+XZbkqR2LqO2kQJ+eKF1G5a8HHgkeZ6LwCl4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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