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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a67c9328e7488042e2a93667b87cd40a55a885d1c03105c28a268b0c42d6dce4' 
  AND token = 'rQgTwYo9DEECtuC2oX7KegeRURW9Y+YKM/KAPwEYrsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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