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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e111193d5a6eaba964eee57aef3e38e692b1d9d1090194be0e9f6651f9b7f47' 
  AND token = '0v4sShI+AbTY5ljdmWCJD5M/416FAcjDzOln7rtoy7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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