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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58a4c1fce6ce139aa89873352e6c64a2881dbda1adb6acb8b89e121acc3e763e' 
  AND token = 'WMwLFy+RRuByG34UskQxUs9oSVcpwSd7L9dFkTNsjH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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