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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a8c9274652d511b0d29dd4d847a8c6c5debf3a5f8b17558223ca5522698d8c7' 
  AND token = 'nMJnlCEdR0wKEIQaMcbN8RGwgjTirKoSJtF2+HN4FYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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