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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd89bbf51245023e7a508bf3ff5ccafac0556f1a8c1577cc81ba0f06579a79c66' 
  AND token = 'kUcj5n4RuVr/8DLHXhYApUHB6ywi2qfsInD7OUC7UCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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