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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '880f28203a2fa228de964863f8cb9a300c14e0461adb5424b5a4ebea1b55edb2' 
  AND token = 'E3n/kae0Z+St4WfEgUUr2PTMLQQ6CisMS2xjeFidAqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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