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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2377e6ba8b30c2149b6b651bfa50b6cb1c96e9e0c89089347a6e498d27d3dec0' 
  AND token = 'T1IxIuaNsskWCI7CtlVRdeP7Oc0QKhhmDCv4ewX9Sr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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