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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '233ab304ae33c02462ea83cf7690f98d754762fa2756fa80aea0f0743d154d7f' 
  AND token = '/g7vpplmhqhC4df8SuOvtmANGvusCEBwy7aQ8mAMxUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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