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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92cf9ac4f4e4d74d7ecac71703ed67b9ba0ed7a220d60867bd0e66823c010bb4' 
  AND token = 'rmYidXjenRhe1gCAZlBDDeg70epgFszBNSr8BNHyQjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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