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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15a39b76b3e53ece1cadba1e68b1b3f418931f0079cddcb978e4a6bce27319a1' 
  AND token = 'ck4HrRLwV2P81LjhlF0jIrIPbufwpE3vjBwwGrYMUnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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