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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '834e326cbec675f338151306acb9c686e98227ab7f301eef6768901b19e21570' 
  AND token = '35paet7ow3NMHJNWle8RFwwYEOsXqzyoLLssJ5mSqes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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