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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cd47a5fbaa19c7604b3f52b0e9ec9279616cef8786d4c4a364ca6dd7eddca7fc' 
  AND token = 'xavvhCNUsAdC9VxKwuIZPabepcZXD3sx7sLV/d4npfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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