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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bb55add0861669e2d9292f6bc9cff70cea3e74a2891e445bab3c09ac393a92a' 
  AND token = 'Vvy7nWojhvSI9AouAFmpoexS8AWy49BnNMQhrz4B1s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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