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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61349d4281873eb7780cd04a625690d873b3cda61ff21044fee024ba0d20a9e9' 
  AND token = 'aXfTItHhsn3kGSYWv9aOnTPwPqqfGleaHdeY1G20KfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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