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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d3d852543a9a59fbf1358c27050e88fe0204f1ad702a0b4e64d44d58518106e' 
  AND token = 'kHD1bCWytthyCBFZEkN0Oza6w3zMlapNSWByt2J5bpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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