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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91b997042940d296bb35043d3e2be41a3b5dd124ceb539f5273ed4feddfb5f10' 
  AND token = 'ELw/dn79nW6Ov2jMKQOdPWiNJuL9RzclKgtuSIfhYYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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