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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1707bd5e4e8f8f361499ed868cab731b4d069dfa00eb1352ad3999ceb29aacd4' 
  AND token = '2NH0MalNTJgcIGuH7TZuf1eWHIrCM8SDGbo4SQG9PHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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