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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5457e0ae3120601df3e93c294c1c57eb65cf34bb9b7854a7d62ac8a174a30c7f' 
  AND token = 'y/WZaGe7Pa2prb5FW7z/J9uQy/0F62cKuqnsZQG+Z4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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