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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4321b55ee06ab13084007ed9385a4ba413e5d22f999900f1f983139e2e9a709c' 
  AND token = 'qZTD9VkAUakfLABdetB0ThH8sRvi53rvpa6livE2C+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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