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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86be1dbcdaf0da39f3a048ab17556884f8e3a50dc52a7792cd2eaac6afc97046' 
  AND token = 'z3aqn7SNe2CH6QctRgGp8RBk9mQCJnox+MVWMYtmSbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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