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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9ec4f5b6e749be08fb3d69796c8d43128a8986dba90f81570c8e2cbd5b551af' 
  AND token = '6A3Xt0VUAHnbgz4sAcCPFxpnmRsHfKR79vdPM0S/dSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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