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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2737c1cc98952fe48b34090ad391ccb2e972b93003c10550957ec06fbf05cb6a' 
  AND token = 'RQ7ruP8RVYntOf7puh5tvMJ3UOdWizRtdyecDsrlAd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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