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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cfaee58901c281aff41c0113ed34bc0bdeeb36d91416f22ca77fa66266a06c92' 
  AND token = 'nav8kfgLqtwugmQgdElf7Bl3g82yBLv8CI/mMHi7BVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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