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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f6aafc441e38f8c073d08b00f4e93f8cb4104743c53e7a98b56e96d645a6ee53' 
  AND token = 'VMW68+ZvDz19AiJdtndHNh06scfcCREsdzkP6Q9V5r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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