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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd6b52cda5c35268ca66702d5383905c9efae3e99cb283bc7e87da93470e9c22e' 
  AND token = '6FvB+BC3aU+No39fj3Tv4+RjN9sXfCOkQ5KajOhYh78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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