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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '33560188c170a4bfa67b0caa587dfc9981a466ea4eced0f1b438d07b7fbda016' 
  AND token = 'H2DDSqdFAk9kos6o/NrqvWgeHLUq2ugp0VUU7G07wQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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