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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7891e8d5001d195b74547fea2ed1b1d62cdfeb756e63fe52d48b99beb42155a' 
  AND token = 'yTTU0ZQgioS+VRgDSIA2xxwpTlNRl9LzHeUSt4mv/Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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