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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36ef2086f404030e4417cd2bdfce9af6d785622094910776433a9e72fc6a5cf3' 
  AND token = 'ed91UM/cSrZd+LWQ647Ujg+hgjUP9cHbmS6dn+e9SR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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