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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd48520079c21486a6e8c5313aa0275c06d3d9927ad483f67a03f5e969f03af72' 
  AND token = 'Skf2nNsTe708K8254H6g1kvDsAGFasA3QvHcAaXPkPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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