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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd506158fc7c5e88ed62bfa4c17c209b3dda4a5b7306bc342aa12acb163207506' 
  AND token = 'L629o40ayYZDZFF6Da2uN3+NdE2VlAH0Vcdv9+dMMCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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